Charting Quadrats with a Pantograph
Charting Quadrats with a Pantograph
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使用受电弓绘制象方图
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通讯作者：
R. R. Hill
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作者：
R. R. Hill
记录植被组成变化的样方法多年来一直被林务局用于各种放牧调查。这样编制的植物形态变化的准确历史，特别是在不同的放牧条件下，对于制定牧场管理原则是无价的。在亚利桑那州南部的圣丽塔山脉保护区，每年绘制80个象限图，在不久的将来将建立更多的象限图。对于熟悉样方图的人来说，很明显，要映射这么多样方需要做大量的工作。到目前为止，所采用的制图方法是常用的一种，即用带子将样方划分为平方分米，并将植被划分为平方分米
The quadrat method of recording changes in the composition of vegetation has been used by the Forest Service in connection with its various grazing investigations for a number of years. The accurate history thus compiled of the changes in plant formations, especially under different conditions of grazing, is invaluable in developing principles of range management. On the Santa Rita Range Reserve, in southern Arizona, eighty chart quadrats are mapped each year and as many more will be established in the near future. It is obvious to those familiar with quadrat charting that the mapping of this number of quadrats involves a great deal of work. The method of charting heretofore followed is the common one in which straps are used to divide the quadrat into square decimeters, and the vegeta-